Spinner Dolphin

Description

Named for its spectacular aerial spinning — leaping up to 3 meters out of the water and rotating up to 7 times on its body axis before re-entering. The body is long and slender with a very long, narrow beak. Coloring is tripartite: dark grey back, light grey sides, white belly.

Senses

Well-developed echolocation and hearing. Their large eyes are adapted for hunting in low-light deep water at night.

Communication

Spinner Dolphins produce complex whistles and burst-pulse sounds. The spinning behavior itself is considered a primary form of communication — different spin types may communicate specific social messages.

Hunting & Diet

Spinner Dolphins are nocturnal feeders. At night, pods form dense groups and move offshore to depths of 600–1,000 feet. Cooperative hunting concentrates prey.

Reproduction

Sexual Maturity

Females reach sexual maturity at 4–7 years; males at 7–10 years.

Social Structure

Found in groups of 20–200. In Hawaii, pods of 200–1,000 are common in protected bays during the day.

Athleticism & Speed

Among the most acrobatic of all dolphins. The spinning leap — up to 7 full rotations — is unmatched by any other cetacean.

Unusual Facts

Spinner Dolphin populations in Hawaii have been significantly impacted by tourism-related disturbance. The US NOAA implemented rules in 2021 restricting close approach to resting spinner dolphin pods.

Lifespan & Threats

20–40 years. Threats include entanglement in tuna purse seine nets, bycatch in gill nets, direct hunting, and tourism disturbance at resting sites.